Cylinder-grinding machine



Dec. 13, 1927.

C. F. DAUSMANN CYLINDER GRINDING MACHINE Filed June 8, 1923 6 SheetS-Sheet l IN VEN TOR lllll l1 l l I l I j 1 'De.13, 1927. l *l 1,652,769

C. F. DAUSMANN CYLINDER GRINDING MACHINE Filed June 8, 1923 6 Sheets-Sheet 2 /M ATTORNEY Dec. `13, 1927.

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`C. F. DAUSMANN CYLINDER GRINDING MACHINE File@ June 8,' 1925 6 Sheets-Sheet f4 ffy. 4. y 79 t, y fg 67 79 l nl i da l1 70 i: -WU

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c. F. DAusMANN CYLINDER GRINDING MACHINE Filed June 8, 1923 6 Sheets-Sheet 5 IN VEN TOR /MATTORNEY Dec. 13, 1927. 1,652,769

C. F. DAUSAMANN CYLINDER GRINDING MACHINE Filed June 8. 1923 6 Sheets-Sheet 6 INVENTOR ('f/Akzi.' BMJ/mmv Patented Dec. 13, 1927.

UNITED STATES CHARLES F. DAUSMANN, F GLENDALE, NEW YORK.

CYLINDER- GRINDIN G MACHINE.

Application filed June 8,

This invention relatesato grinding machines and in particular to machines of this type which are employed for the purpose of grinding copper print-ing cylinders such as are used in the art of intaglio printing,

as for instance in the production of photogravures.

More particularly, my present application concerns certain important practical improvements in the machine disclosed in Letters Patent No. 1.303,861, granted to me on May Q0, 1919. In the patented machine, I provide means for rotating the copper cylinder and for moving a grindinfr stone long1 l5 tudinally upon the surface of the cylinder and at the same time, rotating the stone. It was found that due to the continuous rotation of the stone in one direction, only that part of the stone at one side of its axis of rotation which moved in a direction opposite the direction of rotation of the surface of the cylinder performed the grinding function. This resulted in an uneven wear of the stone. and also rendered it impossible to grind the surface of the cylinder at both of its ends.

It is the primary object and purpose of my present improvements to remedy the above noted objections and to provide means 3f) for imparting to the grinding stone a combined reciprocatory and oscillating movement as the stone is moved longitudinally upon the surface of the cylinder. By the oscillatory movement of the stone as distinguished from its continuous rotation in one direction. I obtain a uniform grinding or polishing action of the stone upon the surface of the cylinder at each side of the :ris of the oscillatory movement of the stone.

Thus. though the cylinder is continuously rotating in one direction. it will be apparent that the surface of the cylinder can be properly ground throughout its entire length.

5 It is also an important feature of my new machine to provide improved means for mounting the grinding stone and adjust-ably regulatingr its bearing pressure upon the surface of the cylinder.

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As a further item of improvement upon my prior invention 1 have provided a` simple and positively actuating means for automatically controlling and reversing the movement of the sliding carriage upon which `the grinning stone is mounted.

Vith the aboveand other objects in View,

1923. Serial N0. 644,109.

the invention consists in the improved grinding machine and in the form, construction and relative arrangement of its several parts as will be hereinafter more fully described, illustrated in the accompanying drawings and subsequently incorporated 1n the subjoined claims.

In the drawings wherein I have illustrated one simple and practical embodiment of the new machine and in which similar reference characters designate corresponding partsV throughout the several views,

Figure 1 is a side elevation of a grinding machine constructed in accordance with my invention;

Figure 2 is an end elevation thereof;

Figure 3 is an elevation of the opposite end of the machine, certain parts being in section;

Figure 4 is a fragmentary elevation partly in section illustrating the mounting and operating means for the reciprocating carrying frame of the grinding stone;

Figure 5 is a detail transverse section taken on the line 5 5 of Figure 1;

Figure 6 is a sectional view taken on the line 6 6 of Figure 5;

Figure 7 is aA detail transverse section talren on the line 7-7 of Figure l;

Figure 8 is a. detail vertical section taken on the line 8-8 of Figure 3;

Figure 9 is a detail elevation partly in section of the automatic reversing means for the stone carriage;

Fig. 10 is a plan view. the different posi tions assumed by the grinding stone being illustrated in broken lines.

Referring in detail to the drawings in which I have disclosed one practical construction of the machine. the severa-1 operating parts are mounted upon a suitably supy ported frame structure 5. said frame structure at its upper end being provided at opposite sides thereof with longitudinally extending Iguide rails 6 for the bed plate 7 of a slidablv mounted carriage. A transversely adjustable tool support 8 is centrally mounted on the bed plate 7 for a purpose which will be later referred to.

Upon opposite ends of the bed plate 7. the standards or uprights 9 are suitably fixed at their lower ends. l These standards at their upper ends are provided with guideways 10 for a reciprocating frame 11. 'Ilic` side bars of this frame which are engaged in the guidenvays terminate at one of their ends in the yoles 12 which receive the `opposite ends of an eccentric 13 having the shaft extensions 11i at its opposite ends which are carrying an adjustable stop screw 19 adapted to engage the underside of the frame 11 and lirnit thev pivotal or swinging' `movement of the plate 16 in one direction with respect to said frame. The holder Q0 for the grinding- Vstone 21 is jouinaled in the plate 16.

lThis holder is provided upon one side with a lug 22 towhich one end of linl 23 is pivot'ally connected, the other 'end of said link being pivoted to an arrn 29 which is Yfixed to a tie rod 21 connecting the uprights or standards 9. rlhis linlr 23 has a lateral or rocking or tilting action on 'its pivotal connection with arin 28.

In order to regulate the bearing 'pressure of the stone upon the surface of the cvlinder being ground, I provide a threaded rod or stein. 25 'suitably lined at its lower end to the platelG and extending; ontwardli7 therefrom, said rod being adapted to receive one or more weights 25 and a nut S37 whicl nav be adjusted into clamping 'engagement upon the uppermost weight.V

Cne end of a flexible elem-ent 27 counected to the upper end of the red 25, tht1 other end of this flexible eienient hein-cj attached to a drinn Q8 fixed upon a shaft Q9 journaled in suitable bearings 30 at its ends which are mounted on the upper ends of the standards 9. Toone end of this shaft e. worm gear 31 is lined and is engaged by a worin 32 on the shaft E33 mounted in the searing- 34 and actuated by the hand wheel 35. Then itis desired to lift the stone to Van inoperative position, it is only neces v to rotate the hand wheel in the pr A er direction tothereby wind vthe flexible ele-- nient 2?" upon the kdrum 29. Upon unwinding the element 27 frein said druiu, the stone will be lowered into contact upon the surface of the cylinder, and the pressure of the stone upon said surface may he adjusted as desired by the operation of the set screw 19. v

To one side ofthe fraine 5 at one of its ends the vhearing 'support 36 for one end ofthe cylinder shaft is rig-idly bolted. To the opposite-end of the freine a casting Si? is secured, said casting' having;` a transversely extending' arin 38 upon one side of which spaced bearing surfaces are formed 'for 'the lowerend of the standard olf support Yl-O in the upper end of which the other cud of the cylinder .shaft is adapted to be inou'ntn ed. The casting arm 3S is provided with threaded Openings adapted to receive the clamping;` bolts l1 and 'said support V10 Vis Vadjusted upon the bearing surfaces 39 .by

nieans ofthe screws 12 arranged up n the larin 38 and contacting with the og tical edges of said support. Ev edges these screws, the support nia;T he mov fl gitudinallv upon the arin 39 until the openings thereof are in line with the thread-4 ed openings in said arm so that the lio 41 inav be threaded heine to securel)v and .lin the support in position. The end of each of the supports Btl a provided with a half bearing. and after the shaft ends of the cylinder 43 have been engaggedr therein, the other halves 4% of the bearings are arranged over the shafts and securely bolted'to the upper ends of said supports.

The main drive shaft 45 extending theen tire length of the machine is suitablv mounted in the lower part of the franie structure,

said shaft at one end of the franie being also f supported by the bearing 16. Between this bearing and the franse end a belt wheel 47 is lined upon the drive shaft and is connected by the belt 118 with a relitti-velg.'v sinall wheel 19 fixed upon the shaft 50 journaled in the bearing' arm 52 fixed to one side of the frame 5. A 53 tired upon the shaft 50 is engaged with a, relatively large Lejear 51 which is secured to one end ofthe shaft of the printing cylinder 4.3 wherebyr said cylinder is rotated.

In the upper portion of the frame structure 5 and centrally thereof the longitudinali;T extending' worin shaft 55 is rotatablyinounted, one end of this shaft having a gear 56 fixed thereto adapted for engageihent h v the pinion 5T secured upon a shaft 58 which is journaled in one of the arins of an angular lever 59 fulcruined for rocking inoveuient upon the main shaft 45. A second larger gear wheel 60 is valso lined upon the shaft 58 and is in niesh with a pinion 61 secured on the main shaft 45. Vlhe other arin of the lever 59 is provided Lwith a suitable operating handle (i2 and has a slot 83 formed therein to receive the stop pin lived in the end of the fraine and which lirel its the shift ing movement of said angular lever to enthe pinion 57' with the gear 56 or to disengage the pinion frein sait. gear.

Upon one vend of the carriagebed T a half nut is vertically adjustable in a suitable guide 66. Preferahly..this half nut is adjusted b v the eccentric device shown in Figuires 5 and 5 of the drawiii rl`hus the shank portion 6T of the nut which is movable in the guide GS is provided with :in opening to receive the eccentric 68 of the shaft 69 which is lig-ed to the operating' lever 79. lWhen the operating' levcr is in the full line position as shown in TFigure 5 of the di u'- ings. the threads of the half nut 65 are eug'aged with the threads the worin shaft 55. Bv throwing this l.I ,s over to the dotted line position, tie eccentric G8 acts to move the half nut upwardly out of engagement with the worm shaft to an inoperative position. The purpose ofthis means for disconnecting the carriage from the worm shaft or screw will presently appear.

To one side of the frame 5 a longitudinally extending rack 71 is suitably secured, the teeth of said rack being engaged b v a pinion 72 fixed upon the shaft of the hand wheel 73 which is journaled in a supporting bracket 74 fixed to the bed plate 7 of the carriage.

Along one side of the frame 5 the longitudinally disposed shaft 75 is journaled in suitable bearings 76 and a beveled gear 77 journaled in an arm 78 on the carriage bed is keyed or splined for sliding ,movement along this shaft. A vertically disposed shaft 79 is mounted in spaced bearings 80 on one of the carriage standards or uprights 9 and a beveled gear 81 on the lower end of this shaft meshes with the gear 77. The beveled gear 82 on the upper end of the shaft 79 is engaged with a beveled gear 83 which is xed to one of the shaft extensions 14 of the eccentric 13.

Upon one end of the shaft 75 the gear wheel 84 is fixed and meshes with a similar gear 85 mounted upon a stud shaft xed to the frame, said latter gear being engaged with a pinion 86 secured upon the main drive shaft 45.

For the purpose of automatically controlling the movement of the carriage and .reversing its traveling movement when the grinding stone reaches the end of the c vlinder 43, I provide the mechanism illustrated in FigureA 9 of the drawings. One end of the worm shaft or screw is journaled in a bracket arm 87 fixed to the end of the machine frame and upon this shaft end the opposed spaced beveled gears 88 are loosely mounted. A. double clutch member is keyed upon the shaft for sliding movement between the gears 88, the ends of said member and the gears being provided with the usual frictionalli7 coacting` clutch surfaces so that when the member 89 is shifted inY one direction. one of said gears is locked to the shaft and when shifted in the opposite direction the first gear is released and the other gear locked to the shaft. rlhe gears 88 are engaged at their lower sides by a beveled driving pinion 90 fixed. upon the upper end of a vertically disposed shaft 91 mounted in a suitable bearing formed on the bracket arm 87. To the low-er end of this shaft the beveled pinion 92 is fixed and meshes with a similar beveled pinion 93 fixed upon the end of the drive shaft 45.

The clutch member 89 is shifted by a yoke l94 which is fixed to the upper end of a lever 95 fulcrumed intermediate of its ends as at 96 upon the bracket 97 fixed to the machine frame. The lower end of this lever is provided with a head having oppositely beveled faces 98 at its lower side with which similarly beveled faces 99 on the upper end of a locking member 100 are adapted to coact. This member is mounted for vertical movement under the, action of av spring 101 in a guide cavity formed in the end of an arm 102 which is integral with the bearing bracket 103 fixed to the end of the machine framev and in which the end of the drive shaft- 45 is iournaled.

The lever 95 is actuated by a longitudinally movable rod 104 which is pivotally connected at one of its ends as at 103 to the upper end of said lever. This rod extends substantially the full length of the frame and is supported in suitable guide lugs 106 fixed to one side of the frame. One of these lugs is provided with an adjustable set screw 107 adapted to engage the shiftable rod and retain the leverv95 in a neutral position. as seen in Figure 9.

The carriage bed 7 is provided adjacent its opposite ends with the downwardly project-- ing apertured lugs 108 through which the rod 104 looselyv extends. Upon this rod in spaced relation to each end thereof the fixed and loose collars 109 and 110 respectively. are disposed and the ends of the coil spring 111 surrounding the rod 104 are attached tb said collars. These springs serve as cushioning means when the lugs 108 on the carriage bed strike the loose collars 110 so that said springs are compressed in the shifting movements of the rod 104.

Before grinding the cylinder. the roughened surface thereof is first turned down by a suitable cutting tool mounted in the tool rest 8. During such operation the clutch member 89 is held in a neutral position by fixing the rod 104 against movement by means of the set screw 107 and the lever 59 is actuated to disengage the pinion 57 from the gear 56. The hand wheel 73 may now be turned so that the pinion 72 will move along the rack 71 and thus shift the carriage as desired to properly position the cutting tool with respect to the revolving cylinder. It is. of course understood vthat during this manual operation.l the nut is in an inoperative position. having been lifted from the worm or lead screw b v the operation of the eccentric 68. At any time. however. the nut may be engaged with said lead screw and the lever 59 actuated to engage pinion 57 with gear 56 so Ythat the carriage will be automatically moved after the cutting tool has been initially positioned and turn down the surface of the cylinder throughout its length.

Uien the cylinder is to be ground the bar 104 is released by loosening the set screw 107. lVhen the carriage is at one end of its travel with one of the stops k108 engaged against one of the collars'110, the lever 95 will be in an angular position with respect Vto that seen in Figure 9 and the clutchmember 89 will be in drivingengagement with one of the gears 88. One of the beveled faces 99 of the locking member 100 coacting with one of the beveled faces 98 on the -lower end of the lever effectually holds the lever in such position and maintains the drivingv connection. rihus rotation will be transmitted from the drive shaft l5 through the vertical shaft 91 and the connecting gearing to one of the gears 88 to rotate the worm f or-lead screw 55 in one direction and'cause the reciprocating movement of the stone in one direction, the face of the stone at one side ofits axis has a grinding action upon the surface of the cylinder, and during the reciprocating movement in the opposite direction the surface of the stone at thev other side of its axis will grind the surface of the cylinder. As seen in Figure 10 of the drawings, A indicates the position assumed by the stone holder at the end of its outward reciprocating motion, and B indicates the position of the stone holder at the end of its inward movement. As the axis of the stone is thus shifted in a straight line maintained by frame 11 and guideways 10, itis oscillated about its own axis at 25 by connection of the lug 22 to link 23. The pivoting of this lug'to link 23 would tend to cause the center ofthe stone to swing in an arc about sai-d pivot, but as this is impossible because of thc mounting of the stone carriage the pivot itself moves slightly toward and from the line of reciprocation of the 'stone as permitted by lat-eral rocking of `link 23 on its pivot on arm 23. Thus, there will be'uniform wear Aupon the sit-one and the surfaceV of the cylinder will be vuniformly grounddown to its eXtreme ends. Y Vilhen the carriage reachesthe limit of its movement in one direction and one of the stops 108 engages the collar 110. the rod 104 is shifted to reverse the angular position .of the lever Q5 and disengage the clutch member 89 from the one gear 88 and engage saidmember with the other gear 8S so that the rotation of the worm orlead screw 55 will be reversed, thus automatically reversing the direction of travel of the carriage;

After lthe grinding operation has been completed, Vthe wheel 35 is turned to rotate the shaft29 and wind the iexible connection `27 on the drum 28, thus lifting the grinding stone from the cylinder so that the lattercan be conveniently removed.

:from the foregoing' description considered in connection with the accompanying drawings, it will be seen that I have produced a grinding machine for copper printing cylinders whereby the cylinder may be very quickly provided with a perfectly smooth and highly polished surface to receive the etching. In the accompanying description. I

have referred with some particularity to the relative mounting and arrangement of the several parts of the machine as in practice, the illustrated embodiment of the invention has been found highly satisfactory. How- ,ven it will be manifest that the purpose of my present `improvements might be attained in other alternative machine structures, and I therefore reserve the privilege of resorting to all such legitimate changes in the form, proportion and relative arrangement of the several parts as may be fairly embodied with in the spirit and scope of the invention as claimed.

I claim:

l. In a grinding machine Jfor printing cylinders, a carriage, a frame mounted in the carriage for rectilinear reciprocating movement in a direction at right angles to the movement of the-carriage, an oscillatory grinding stone mounted in said frame and adapted for movement across the surface of the cylinder at right angles to the cylinder axis in the reciprocating movement of said frame, means for reciprocating said frame, and means mounted in the carriage and connected with said stone to cause an oscillating motion of the latter about its own cento duc solely to the reciprocation thereof.

2. In a grinding machine for print-ing cylinders, a carriage, a frame mounted in the carriage for rectilinear reciprocating movement in a direction at right anales to the movement of the carriage, an oscillatory grinding stone mounted insaid frame and adapted for movement across the surface of the cylinder at right angles to the cylinder airis in the reciprocating movement of said frame, means for reciprocating` said frame, and a link member Vmounted at one of its ends in said carriage and having a pivotal .connection at its other end with said stone whereby an oscillating motion about its own center is imparted to the stone due solely to the reciprocation thereof.

In a grinding machine for printing cylinders. means for rotatably supporting a cylinder. a carriage 'mounted to travel longitudinally of the cylinder and operating means therefor, a frame mounted Vfor rectilinear reciprocating movement in said carriage at right angles to the line of travel thereof, a grinding stone, a 'holder for said grinding stone pivotally mounted in said `trame for vert-ical swinging movement and for oscillation about a fixed central axis relative to said frame, and means mounted in said carriage and connected With said stone holder for causing the reciprocating movements thereto to impart an oscillatory motion to said holder.

4. In a grinding machine for printing cylinders, cylinder rotating means, a trame mounted for rectilinear reciprocating movement, a grinding stone carried by said frame and mounted to swing vertically with respect thereto, said stone being arranged for tangential contact upon the periphery of the cylinder, means for reciprocating said frame and stone, and a member having a fixed pivot at one end and pivotally connected at its other end with the stone to impart an oscillating movement to the stone about a central axis during its reciprocating movements.

5. In a grinding machine for printing cylinders, a carriage7 means for mounting a grinding stone upon said carriage for oscillatory motion in a horizontal plane about a central axis and for transverse reciprocating motion at right angles to the axis of the cylinder and in contact. with the surface thereof during the movementof the carriage, means for moving the carriage and stone longitudinally of the cylinder, poWer operated means on the carriage for reciproeating the stone, and additional means connecting the stone With the carriage to cause an oscillatory motion of the stone about its own center by the reciprocating movements thereof.

In testimon that I claim the foregoing as my invention, I have signed my name hereunder.

CHARLES F. DAUSMAN; 

